A figure with this deity's name and the epithet Trismegistus wrote alchemical texts while syncretize
A figure with this deity's name and the epithet Trismegistus wrote alchemical texts while syncretized with the Egyptian god Thoth, and another epithet describes this father of Autolycus as "conductor of souls", Psychopompus. He lulled the hundred eyes of [*] Argos to sleep before slaying him to save Io, and rescued a certain great-grandson by giving him moly on Aiaia and saving him from Ogygyia, Calypso's isle. The rod of Asclepius has one less snake than Caduceus, his staff, and he aided Perseus by lending his characteristic winged sandals. For 10 points, name this Greco-Roman messenger god with a winged cap.
A figure with this deity's name and the epithet Trismegistus wrote alchemical texts while syncretized with the Egyptian god Thoth, and another epithet describes this father of Autolycus as "conductor of souls", Psychopompus.
{Hermes} [prompt “{Mercury}” since he first clue doesn't apply to him but all the rest do]